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a b s t r a c tIn order to determine the radiological hazards indices of chemical fertilizers commonly used in Upper Egypt, The concentrations of natural radionuclides 226 Ra, 232 Th and 40 K in seven types of chemical fertilizers used in Upper Egypt have been measured by gamma spectrometry using NaI (Tl) 3 00 Â 3 00 detector. The ranges of concentration levels of 226 Ra, 232 Th and 40 K were 12 ± 0.6e244 ± 12.6, 3 ± 0.2e99 ± 4.9, and 109 ± 5.5e670 ± 34 Bq kg À1 , respectively. In the other side, the range values obtained from fertilizer samples under investigation were (33.1e392.3 Bq kg À1 ), (0.6e2.7), (15.6e177.8 nGy h À1 ) and (20.1e229.1 mSv y À1 ) for radium equivalent activity, g-radiation hazard index I gr , Dose rate (nGy h À1 ) and annual effective dose equivalent (AED) in the air to the occupational workers, respectively. The obtained values were compared with available reported data from other countries in literature.

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